PHY SIG Frame Structure for IEEE 802.11aj (45GHz) - PowerPoint PPT Presentation

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PHY SIG Frame Structure for IEEE 802.11aj (45GHz)
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PHY SIG Frame Structure for IEEE 802.11aj (45GHz)

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  1. PHY SIG Frame Structure for IEEE 802.11aj (45GHz) Date: 2014-09-09 Presenter: Haiming Wang Authors/contributors:

  2. Abstract • The submission presents the physical layer (PHY) SIG frame structure to enable downlink multi-user MIMO WLAN communications for IEEE 802.11aj (45GHz). • This submission is an update version of IEEE 802.11-14/0883r0 which was presented in July 2014 plenary session. Slide 2 Shiwen He, Haiming Wang

  3. Background • Challenges of future WLAN • Limited spectrum resources • Requirement for very high data rate • Features of future WLAN • Large bandwidth • Multiple channel mode • Multi-user • Multi-stream • Beyond 10 Gbps throughput Slide 3 Shiwen He, Haiming Wang

  4. Technology Objects • Technical goal: • Dynamic BW • Multi-user & Multi-stream • Energy efficiency • Scrambler • Single-Carrier & OFDM • Dynamic BW • Dynamic channel BW selection for 1080 MHz BSS to enhance the adaptability in different channel environments and improve spectral efficiency. Slide 4 Shiwen He, Haiming Wang

  5. Technology Objects • Multi-user & Multi-stream Achieve a multi-user multi-stream control to obtain the multiplexing gain. • Energy efficient communication Achieve energy efficient communication, i.e., allow non-AP STAs in TXOP power save mode to enter Doze state during a TXOP. • Scrambler Scrambling effectively reduces the PAPR in OFDM system . • Single carrier & OFDM Switch between SC and OFDM. Slide 5 Shiwen He, Haiming Wang

  6. SIG-A structure • The SIG-A field carries information required to interpret PPDUs. To track the change of CSI, a midamble field is added to indicate the transmission style of the training field in SC PHY. To support more MCSs, the number of the bits in the MCS field is increased to 4 from 3. The researches in [1] have revealed that CRC 0x83=x8+x2+x+1 is enough to check the SIG-A fields. Slide 6 Shiwen He, Haiming Wang

  7. Explanation of each field in SIG-A • Scrambler Slide 7 Shiwen He, Haiming Wang

  8. Explanation of each field in SIG-A • SC-PHY & OFDM-PHY Slide 8 Shiwen He, Haiming Wang

  9. Explanation of each field in SIG-A • Dynamic bandwidth Slide 9 Shiwen He, Haiming Wang

  10. Explanation of each field in SIG-A • Multi-user & Multi-stream Slide 10 Shiwen He, Haiming Wang

  11. Explanation of each field in SIG-A • Multi-user & Multi-stream Slide 11 Shiwen He, Haiming Wang

  12. Explanation of each field in SIG-A • Multi-user & Multi-stream Slide 12 Shiwen He, Haiming Wang

  13. Transmitter Block Diagram for SIG-A fields Using SC Transmission • The SIG-A field carries information required to interpret PPDUs transmission. And the SIG-A field is transmitted with SC transmission. Slide 13 Shiwen He, Haiming Wang

  14. SIG-B structure • The SIG-B field carries information required to interpret PPDUs in MU transmission case. Slide 14 Shiwen He, Haiming Wang

  15. Transmitter Block Diagram for SIG-B fields Using OFDM MU PPDU Transmission • The SIG-B field carries information required to interpret PPDUs in MU transmission case. In other word, the SIG-B field is only transmitted for the MU case. Slide 15 Shiwen He, Haiming Wang

  16. Reference [1] P. Koopman,T. Chakravarty, Cyclic Redundancy Code (CRC) Polynomial Selection For Embedded Networks, The International Conference on Dependable Systems and Networks, DSN-2004. [2] PHY SIG Frame Structure for IEEE 802.11aj (45GHz), IEEE 802.11-14/0883r0 Slide 16 Shiwen He, Haiming Wang

  17. Thanks for Your Attention. Slide 17 Shiwen He, Haiming Wang

  18. Questions & Replies • What is the motivation for the design of our SIG? • The main role of our SIG is to carry information which is required to interpret the physical protocol data unit (PPDU). • The basic required information to carry is listed as: • Dynamic bandwidth • Multi-user & Multi-stream • Energy efficiency • Scrambler initialization • Single & Multi-carrier Slide 18 Shiwen He, Haiming Wang

  19. Questions & Replies • What is the difference between VHT-SIG and our SIG? • The scrambler initialization field is included in our SIG, which is located in the service field that is removed in IEEE 802.11ac, due to the motivation of further enhancement of reducing the PAPR of SIG and reducing the SIG transmission overhead, such as the transmission of SIG-B in single user transmission for IEEE 802.11aj (45GHz). • The indication of the dynamic bandwidth is also included in the SIG field. • A subfield which indicates the modulated model is added in the SIG field. Slide 19 Shiwen He, Haiming Wang

  20. Questions & Replies • What are the key features of the SIG? • The key features of the SIG are listed as follows: • Scrambler initialization: reducing the PAPR. • Dynamic bandwidth: improving the spectral efficiency. • Multi-user & Multi-stream: enhancing the system capacity. • Energy efficiency: reducing the power consumption. • SC & OFDM: considering the PAPR and the power amplifier efficiency due to the fact that, in some cases, the power efficiency is more important than the spectral efficiency in the mmWave WLAN systems. Slide 20 Shiwen He, Haiming Wang

  21. Questions & Replies How to support more MCSs? To support more MCSs, the number of the bits in the MCS field is increased to 4 from 3. Combining with SC/OFDM field, IEEE 802.11aj(45GHz) can support 32 MCSs. Slide 21 Shiwen He, Haiming Wang